Per rotoworld:
ESPN's Adam Schefter reported on NFL Insiders Monday that "it's not realistic" to expect Rob Gronkowski (back) to play in Week 1 against the Bills.
We've considered Gronkowski "doubtful" for Week 1 all along. Now the decision will come down to whether Gronk should go on the reserve/PUP list, which would cost him the first six games of the season.
The Patriots don't have to make that call for another few weeks.
Look for Zach Sudfeld to flirt with TE1 fantasy value for as long as Gronkowski is out. Gronkowski is still worth considering in the third and fourth rounds of fantasy drafts because he's a massive week-to-week difference maker whenever he dresses.